Bed-motion for printing-presses.



No. 738,797. PATENTED SEPT. 15, 1903.

H. HARTT.

BED MOTION FOR PRINTING PRESSES.

APPLICATION FILED APR. 28. 1902.

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No. 738,797. PATENTED SEPT. 15, 1903.

' H. HARTT.

BED MOTION FOR PRINTING PRESSES.

APPLICATION FILED APR. 28. 1902 NO MODEL. 4 SHEETS-SHEET 2.

A a/m THE NORRIS PETERS co, PHoTo u-riw; vusnmm'onufc.

PATENTED SEPT. 1 5

. H, HARTT.

BED MOTION FOR PRINTING PRESSES.

APPLICATION FILED APR. 28, 1902.

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NO MODEL.

PATENTED SEPT. 15, 1903. H. HARTT. BED MOTION FOR PRINTING PRESSES.

4 SHEETS-SHEET 4 APPLICATION FILED APR. 28, 1902.

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ml! M INYENTOR BY ms ATTORNEY WASHINGTON n c WITNESSES llnrTien STnTns Patented September 15, 1903.

PATENT Grinch.

HENRY HARTT, OF CHICAGO, ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 738,797, dated September 15, 1903.

Application filed April 28, 1902.

To all whom it may concern: p

Be it known that I, HENRY HARTT, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented certain new auduseful Improvements in Bed-Motions for Printing-Presses, of which the following is a specification.

My invention relates to bedmotions for printing-presses, and has for its object improvement in the reversing mechanism therefor.

My invention is illustrated in the accompanying drawings, in which Figure 1 is a partial transverse section of a printing-press, part of the mechanism being in elevation. a rack-frame at its extreme position, the operating mechanism being in plan. Fig. 3 is a section on line 3 3 of Fig. 2-with the rackframe in elevation. Fig. 4 is an elevation of the reversing-crank. Fig. 5 is a section of the driving mechanism on line 5 5 of Fig. 1. Figs. 6 and 7 correspond to Figs. 1 and 4. and show modified forms of construction, and Fig. 8 is a detail of the crank-pin of Figs. 6 and 7.

Supported by the press-frame A is a bed B, which runs on guides I), and over the bed B is the impression-cylinder 0. Supported by a bridge E and a bearing A in the frame A is a hollow shaft F. One end of the shaft F is enlarged and provided with a chamber F which is bored out to fit the hub G of the gear G. The enlarged portion of the shaft F is provided with slots F through which pass the arms of the gears G. Two or more of the arms of this gear are enlarged, as shown at G in Fig. 5, and are made to fit the slots F This construction permits the gear to slide axially with respect to the shaft F, but holds the gear and shaft so that they rotate together.

The open end of the chamber is closed by a plate F, which is held in position by the bolts F The inner face of the plate F is slightly counterbored to receive the slotted portion of the enlarged end of the shaft F. On the outer face of the plate F are two lugs F which are connected together by a cap F The lugs F and cap F might be cast in one piece solid with the plate F; but by making the cap F separate it is easier to finish the Fig. 2 is a horizontal section of $erial N0. l1041948. (N0 model.)

inside faces, which are lined with gibs F Inside the hollow shaft F is another shaft M, on the left-hand end of which is a crank M. The hub of this crank has a bearing in the plate F, which is bored out for this purpose. The outer end of the crank M, which carries the pin M is finished on the sides and fits between the gibs F By this construction the crank M and pin M are permitted to move axially with respect to the plate F, the said lugs F and their gibs F furnishing longitudinal guides for such movement.

Power is conveyed from the pulley P through a gear (not shown) to the gear L, which is secured to and drives the hollow shaft F. Secured to and turning with the gear L is a smaller gear L, which meshes with a gear K on the shaft K. On the shaft K is a cam K which engages and moves a fork G which is held at a fixed axial position on the shaft M by collars G. The rotation of the cam K therefore gives the shaft M and its crank M and pin M a reciprocating axial movement. Also on the shaft K is a cam K which engages a lever K which lever acts to move a collar K axially on the shaft F. The collar K is connected by bolts K to the hub G of the gear G.

Secured to the bottom of the bed B is a frame H, which is provided with racks H and H adapted to be engaged by the gear G. These racks are so located that they are engaged alternately by the gear G as it is reciprocated axially by the action of the cam K Attached to the frame H are vertical guides H adapted to be engaged by the pin M on the crank M. The cam K is so arranged that immediately upon the gear G arriving at the end of one of the racks H or H the pin M will he moved axially into the corresponding guide H whereupon during the succeeding half-revolution of the crank M the bed B will be brought to a stop and have its direction of motion reversed. During this stoppal and reversal of the bed the gear G is shifted from one rack to the other by the cam K Immediately upon the completion of this half-revolution of the crank the cam K withdraws the pin M from the guide H The bed is then free to be moved by the gear G until the said gear comes to the other end of the racks, when theoperations are repeated through the actions of the cams K and K It will be observed that the gear G is not driven by a key or feather, but by the hollow shaft F through contact with the arms G6 near the periphery. This reduces the strain at the point of driving contact on the gear, and consequently reduces the danger of looseness in a gear that has to be shifted axially. It will also be observed that the crank M is not rotated through the action of the shaft M, but by means of the lugs F on the disk F. As these lugs are placed opposite or near the axis of the pin M and are closely adjacent to the guides H there is obtained ample strength without making either the shaft M or the crank M heavy. The driving of the crankpin at this place by a plate or disk carried on a large shaft avoids any danger of springing and holds the pin securely at a definite position with respect to the gear G. This insures the proper engagement of the pin M and gear G when shifted, as previously described, bythe action of the cams K and K It also relieves the shaft M of all strain, except that necessary to move the crank-pin M to and from engagement with the guides H In Fig. 6 is shown a modification by which the rack-frame is divided into two parts, H carrying'the racks H and H and H carrying the guides H These two parts are separated and the bridge E inserted between them. This reduces the overhang of the crank beyond the bearing of the shaft F. Another modification shown in the same figure and also in Figs. 7 and 8 is that the crankpin is held in a cylindrical socket in the plate F, and the function of the crank M is to slide the pin axially to and from engagement with the guides H In this case the crankpin M is made up of a cylinder M and a roller M, which are held together by an internal in M and nut M". In the cylinder M is a ho e M", which is engaged by a pin M in the end of the crank M. The socket F is slotted at F to permit of the movement of the pin M and its engagement with the crank-pin.

What I claim is- 1. In the reversing mechanism ofa printingpress, a crank-pin, a hollow shaft arranged to revolve said pin about the center of said shaft, and a second shaft within said hollow shaft and arranged to move said pin axially with respect thereto.

2. In the bed-moving mechanism of aprinting-press, the combination with a reciprocating bed, a frame secured to said bed and provided with horizontal racks and vertical guides, a gear for engaging said racks, anda crank-pin for engaging said guides, of means for shifting said gear from one rack to an- 'other, and independent means for shifting said crank-pin to and'from said guides.

3. An axially-movable shaft, a crank secured to said shaft and provided with a crankpin, and a second shaft consisting of a tube surrounding the first-mentioned shaft and provided with longitudinal guides adapted to engage and drive said crank at a point adjacent to said pin.

4. In the bed-moving mechanism of a printing-press, a frame providing upper and lower racks, vertical guides secured to said frame and located opposite the ends of the racks, a gear adapted to engage said racks, a crankpin adapted to engage said guides, a shaft arranged to drive said gear and said pin, a cam for moving said gear from one rack to the other, and a second cam for moving said pin to and from engagement with said guides.

5. In the bed-moving mechanism of a printing-press, the combination with a reciprocating bed, of a frame secured to said bed and provided withvertical slots serving as guides, a crank-pin adapted to fit into said guides, and means for moving said crank-pin axially so as to insert it in and withdraw it from said guides.

6. The combination with the bed of a printing-press, of a frame secured to said bed and provided with upper and lower racks by which the bed is driven, a rotary shaft provided with an enlarged portion at one end, a gear driven by the enlarged portion of said shaft and movable with respect thereto so as to engage the upper and lower racks alternately, a plate secured to the end 'of the enlarged portion of said shaft and provided with a guide on its outer face, a crank-pin supported within said guide and axially movable with respect there to, and bed-reversing guides located opposite the ends of the racks and adapted to be engaged and disengaged by the axial movement of said crank-pin.

7. In the bed-moving mechanism of a print ing-press, the combination with a reciprocating bed and vertical guides rigidly secured thereto, of a shaft, a gear and a crank-pin driven by said shaft, and means for shifting said gear and said crank-pin relatively with respect to each other and axially and independently with respect to said shaft.

Signed at Chicago, Illinois, this 23d day of April, 1902.

HENRY HARTT. Witnesses:

WM. A. ROWLAND, O. L. REDFIELD. 

